Three-sided fireplace



FIG. 1 is a front and right-side perspective view of the three-sided fireplace in accordance with my new design;

FIG. 2 is a top plan view thereof;

FIG. 3 is a front elevational view thereof;

FIG. 4 is a right side elevational view thereof; and,

FIG. 5 is a left side elevational view thereof.

The rear elevational view and bottom plan view of the three-sided fireplace are not shown and therefore form no part of the claimed design.

The broken lines in the figures are directed to environment and are for illustrative purposes only; the broken lines form no part of the claimed design. 

CLAIM The ornamental design for a three-sided fireplace, as shown and described. 